(Seattle, WA)  --  Former Seahawks running back Derrick Coleman is slated to be sentenced in a week, after pleading guilty to vehicular-assault and hit-and-run charges.  Police say Coleman claimed to have smoked a synthetic drug with effects similar to those of marijuana, about an hour before an October 2015 crash in Bellevue that left another driver with a broken collarbone.  Coleman initially pleaded not guilty to the charges, but a plea agreement reached this week may enable him to avoid jail time and perform community service.